Display Device

ABSTRACT

A display device that is capable of being manufactured through a simplified process and at reduced cost is disclosed. The display device is configured such that a plurality of grouped cathode electrodes and a plurality of grouped black matrices intersect each other in the state in which an encapsulation unit is disposed therebetween in order to form a touch sensor, so that a process of forming first and second touch electrodes is omitted and a separate adhesion process becomes unnecessary, whereby structural simplification is achieved while costs are reduced.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Republic of Korea PatentApplication No. 10-2018-0142357 filed on Nov. 19, 2018, which is herebyincorporated by reference in its entirety.

FIELD OF TECHNOLOGY

The present disclosure relates to a display device, and moreparticularly to a display device that is capable of being manufacturedthrough a simplified process and at reduced cost.

BACKGROUND

A touchscreen is an input device that allows a user to input a commandby selecting one of multiple instructions displayed on a screen, such asthat of a display device, using a user's hand or an object. That is, thetouchscreen converts the contact position, at which the user's hand orthe object directly contacts the touchscreen, into an electrical signalto receive the instruction selected at the contact position as an inputsignal. Use of such a touchscreen has been increasing, since thetouchscreen can replace a separate input device that must be connectedto the display device for operation, such as a keyboard or a mouse.

In many cases, the touchscreen is generally attached to the frontsurface of a display panel, such as a liquid crystal display panel or anorganic light-emitting display device, using an adhesive. Such aconfiguration may incur limitations or problems. For instance, since thetouchscreen is separately manufactured and is then attached to thedisplay panel, the process is complicated, and costs are increased. Inaddition, a touch pad for providing a driving signal to the touchscreenis formed on a substrate for the touchscreen, whereby the size of abezel area is increased.

SUMMARY

Accordingly, the present disclosure is directed to a display device thatsubstantially obviates one or more problems due to the limitations anddisadvantages of the related art.

An aspect of the present disclosure is to provide a display device thatis capable of being manufactured through a simplified process and atreduced cost.

Additional advantages, aspects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following, or may be learned from practice of theinvention. The aspects and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To realize these aspects and other advantages and in accordance with theaspect of the disclosure, as embodied and broadly described herein, adisplay device is configured such that a plurality of grouped cathodeelectrodes and a plurality of grouped black matrices intersect eachother in the state in which an encapsulation unit is disposedtherebetween in order to form a touch sensor, so that a process offorming first and second touch electrodes is omitted and a separateadhesion process becomes unnecessary, whereby structural simplificationis achieved while costs are reduced.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 is a block diagram showing a display device according to oneembodiment of the present disclosure;

FIG. 2 is a circuit diagram showing each subpixel disposed in a displaypanel shown in FIG. 1 according to one embodiment of the presentdisclosure;

FIG. 3 is a plan view showing, in detail, the display panel shown inFIG. 1 according to one embodiment of the present disclosure;

FIGS. 4A and 4B are sectional views of the display device taken alonglines I-I′ and II-II′ of FIG. 3, respectively;

FIG. 5 is a sectional view showing a display device including apassivation film that forms an undercut structure together with a bankaccording to one embodiment of the present disclosure;

FIG. 6 is a sectional view showing a display device including anauxiliary line according to one embodiment of the present disclosure;

FIGS. 7A and 7B are plan views showing various embodiments of a secondtouch electrode shown in FIG. 3 according to one embodiment of thepresent disclosure;

FIG. 8 is a waveform view showing a control signal for selecting adisplay period and a touch-sensing period of a display device having atouch sensor according to one embodiment of the present disclosure; and

FIGS. 9A and 9B are waveform views showing the waveforms of signalssupplied to the display device having the touch sensor according to oneembodiment of the present disclosure during the display period and thetouch-sensing period.

DETAILED DESCRIPTION

Hereinafter, exemplary embodiments of an organic light-emitting displaydevice according to the present invention will be described in detailwith reference to the accompanying drawings so that the presentinvention will be easily realized by those skilled in the art.

FIG. 1 is a block diagram showing a display device according to thepresent disclosure.

The display device shown in FIG. 1 includes a display panel 200, a firsttouch-driving unit 206, a second touch-driving unit 208, a scan-drivingunit 204, and a data-driving unit 202.

The scan-driving unit 204 sequentially supplies a scan signal to aplurality of scan lines SL (including SL1 to SLm) of the display panel200 to sequentially drive the scan lines SL. The scan-driving unit 204is formed on a substrate of the display panel 200 using at least one ofa thin film transistor having an oxide semiconductor layer or a thinfilm transistor having a polycrystalline semiconductor layer. At thistime, the thin film transistor of the scan-driving unit 204 is formedsimultaneously with at least one thin film transistor disposed in eachsubpixel in the same process as the at least one thin film transistordisposed in each subpixel.

The data-driving unit 202 supplies data voltages to a plurality of datalines DL (including DL1 to DLn) of the display panel 200 in order todrive the data lines DL.

The first touch-driving unit 206 supplies a driving pulse to first touchelectrodes through first touch-routing lines TL (including TL1 to TLi),and the second touch-driving unit 208 senses variation in charges oftouch sensors through second touch-routing lines RL (including RL1 toRLi).

The display panel 200 displays an image using a plurality of subpixelsarranged in the form of a matrix. As shown in FIG. 2, each subpixelincludes a switching transistor TS, a driving transistor TD, a storagecapacitor Cst, a light-emitting element (e.g., a diode), and a touchsensor Cm.

As shown in FIG. 3, the touch sensor Cm includes a first electrode TEand a second touch electrode RE. The first touch electrodes TE extend ina first direction, and the second touch electrodes RE extend in a seconddirection. The first direction is a direction parallel to one of thescan lines SL and the data lines DL, and the second direction is adirection parallel to the other of the scan lines SL and the data linesDL.

The first and second touch electrodes TE and RE intersect each other inthe state in which an encapsulation unit 140 (see FIG. 4) is disposedtherebetween, whereby mutual capacitance corresponding to the touchsensor Cm is formed at the intersection between the first and secondtouch electrodes TE and RE.

When a scan pulse is supplied to the scan line SL, the switchingtransistor TS is turned on to supply a data signal, which is supplied tothe data line DL, to the storage capacitor Cst and to a gate electrodeof the driving transistor TD.

In response to the data signal supplied to the gate electrode of thedriving transistor TD, the driving transistor TD controls current I thatis supplied from a high-voltage (VDD) supply line to the light-emittingelement 130 to adjust the amount of light emitted by the light-emittingelement 130. Even when the switching transistor TS is turned off, thedriving transistor TD supplies uniform current to the light-emittingelement 130 using the voltage charged in the storage capacitor Cst suchthat the light-emitting element 130 keeps emitting light until a datasignal of the next frame is supplied.

As shown in FIGS. 4A and 4B, the driving transistor TD includes asemiconductor layer 104 disposed on a buffer layer 114, a gate electrode106 disposed so as to overlap the semiconductor layer 104 in the statein which a gate dielectric film 112 is disposed therebetween, and sourceand drain electrodes 110 and 108 formed on an interlayer dielectric film116 so as to contact the semiconductor layer 104.

The semiconductor layer 104 is made of at least one of an amorphoussemiconductor material, a polycrystalline semiconductor material, or anoxide semiconductor material. The semiconductor layer 104 is formed onthe buffer layer 114. The semiconductor layer 104 includes a channelarea, a source area, and a drain area. The channel area overlaps thegate electrode 106 in the state in which the gate dielectric film 112 isdisposed therebetween such that the channel area is formed between thesource and drain electrodes 110 and 108. The source area is electricallyconnected to the source electrode 110 through a source contact holeformed through the gate dielectric film 112 and the interlayerdielectric film 116. The drain area is electrically connected to thedrain electrode 108 through a drain contact hole formed through the gatedielectric film 112 and the interlayer dielectric film 116. Alight-blocking layer 102 is disposed between the semiconductor layer 104and a substrate 101 in order to prevent external light from beingintroduced into the semiconductor layer 104.

The gate electrode 106 is formed on the gate dielectric film 112, andoverlaps the channel area of the semiconductor layer 104 in the state inwhich the gate dielectric film 112 is disposed therebetween. The gateelectrode 106 may be made of one or an alloy of molybdenum (Mo),aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni),neodymium (Nd), or copper (Cu), and may have a single-layer structure ora multi-layer structure. However, the present invention is not limitedthereto.

The source electrode 110 is connected to the source area of thesemiconductor layer 104, which is exposed through the source contacthole formed through the gate dielectric film 112 and the interlayerdielectric film 116. The drain electrode 108 faces the source electrode110, and is connected to the drain area of the semiconductor layer 104through the drain contact hole formed through the gate dielectric film112 and the interlayer dielectric film 116. Each of the source and drainelectrodes 110 and 108 may be made of one or an alloy of molybdenum(Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni),neodymium (Nd), or copper (Cu), and may have a single-layer structure ora multi-layer structure. However, the present invention is not limitedthereto.

The storage capacitor Cst includes first storage electrode 156, secondstorage electrode 152, and third storage electrode 154. The firststorage electrode 156 is formed on the substrate 101, and is made of thesame material as the light-blocking layer 102. The second storageelectrode 152 is formed on the gate dielectric film 112, and is made ofthe same material as the gate electrode 106. The third storage electrode154 is electrically connected to the first storage electrode 156, whichis exposed through a storage contact hole 158 formed through the bufferlayer 114 and the interlayer dielectric film 116. Consequently, thefirst storage electrode 156 overlaps the second storage electrode 152 inthe state in which the buffer layer 114 and the gate dielectric film 112are disposed therebetween to form a first storage capacitor, and thethird storage electrode 154 overlaps the second storage electrode 152 inthe state in which the interlayer dielectric film 116 is disposedtherebetween to form a second storage capacitor. At this time, the firstand second storage capacitors are connected to each other in parallel.

The light-emitting element 130 includes an anode electrode 132, at leastone light-emitting stack 134 formed on the anode electrode 132, and acathode electrode 136 formed on the light-emitting stack 134.

The anode electrode 132 is electrically connected to the drain electrode108 of the driving transistor TD, which is exposed through a pixelcontact hole 120 formed through a passivation film 118 and aplanarization layer 128. The anode electrode 132 of each subpixel isformed to be exposed by a bank 138. The bank 138 may be made of anopaque material (for example, black) to prevent optical interferencebetween adjacent subpixels. In this case, the bank 138 includes alight-blocking material made of at least one of a color pigment, organicblack, or carbon.

The at least one light-emitting stack 134 is formed on the anodeelectrode 132 in a light-emitting area defined by the bank 138. The atleast one light-emitting stack 134 is formed by stacking, sequentiallyor reversely, a hole-related layer, an organic light-emitting layer, andan electron-related layer on the anode electrode 132. In addition, thelight-emitting stack 134 may include first and second light-emittingstacks opposite each other in the state in which a charge generationlayer is disposed therebetween. In this case, the organic light-emittinglayer of one of the first and second light-emitting stacks generatesblue light, and the organic light-emitting layer of the other of thefirst and second light-emitting stacks generates yellow-green light,whereby white light is generated through the first and secondlight-emitting stacks. The white light generated by the light-emittingstack 134 is incident on a color filter located above or below thelight-emitting stack 134, whereby a color image may be realized. Inaddition, each light-emitting stack 134 may generate color lightcorresponding to each subpixel without a separate color filter torealize a color image. That is, the light-emitting stack 134 of the red(R) subpixel may generate red light, the light-emitting stack 134 of thegreen (G) subpixel may generate green light, and the light-emittingstack 134 of the blue (B) subpixel may generate blue light.

The cathode electrode 136 is formed to be opposite the anode electrode132 in the state in which the light-emitting stack 134 is disposedtherebetween.

The cathode electrode 136 also serves as the first touch electrode TE,and is thus grouped into a plurality of parts so as to be connected tofirst touch-routing lines 184. The cathode electrode 136 is connected toa first touch pad 170 via the first touch-routing line 184. At thistime, the first touch-routing line 184 is disposed on at least onedielectric film disposed below the encapsulation unit 140, for example,the passivation film 118. In addition, the first touch-routing line 184is connected to a touch pad middle electrode 174 exposed through arouting contact hole 162 formed through the passivation film 118.

The first touch pad 170 is disposed to be exposed by the encapsulationunit 140. The first touch pad 170 includes a touch pad lower electrode172, a touch pad middle electrode 174, and a touch pad upper electrode176.

The touch pad lower electrode 172 is made of the same material as thegate electrode 106, and is disposed on the gate dielectric film 112.

The touch pad middle electrode 174 is made of the same material as thesource and drain electrodes 110 and 108, and is disposed on theinterlayer dielectric film 116. The touch pad middle electrode 174 isconnected to the touch pad lower electrode 172 through a first padcontact hole 164 formed through the interlayer dielectric film 116.

The touch pad upper electrode 176 is made of the same material as theanode electrode 132, and is disposed on the passivation film 118. Thetouch pad upper electrode 176 is connected to the touch pad middleelectrode 174, which is exposed through a second pad contact hole 178formed through the passivation film 118.

The encapsulation unit 140 prevents external moisture or oxygen frompermeating into the light-emitting element 130, which has low resistanceto external moisture or oxygen. To this end, the encapsulation unit 140includes a plurality of inorganic encapsulation layers 142 and 146 andan organic encapsulation layer 144 disposed between the inorganicencapsulation layers 142 and 146. The inorganic encapsulation layer 146is disposed in the uppermost layer. In this case, the encapsulation unit140 includes at least two inorganic encapsulation layers 142 and 146 andat least one organic encapsulation layer 144. In the present disclosure,the structure of the encapsulation unit 140 in which the organicencapsulation layer 144 is disposed between the first and secondinorganic encapsulation layers 142 and 146 will be described by way ofexample.

The first inorganic encapsulation layer 142 is formed on the substrate101, on which the cathode electrode 136 is formed, to be closest to thelight-emitting element 130. The first inorganic encapsulation layer 142is made of an inorganic dielectric material that is capable of beingdeposited at a low temperature, such as silicon nitride (SiNx), siliconoxide (SiOx), silicon oxide nitride (SiON), or aluminum oxide (Al₂O₃).Since the first inorganic encapsulation layer 142 is deposited in alow-temperature atmosphere, therefore, it is possible to reduce damageto the light-emitting stack 134, which has low resistance to ahigh-temperature atmosphere, during the process of depositing the firstinorganic encapsulation layer 142.

The organic encapsulation layer 144 serves as a buffer for alleviatingstress between the respective layers generated due to bending of theorganic light-emitting display device, and strengthens a planarizationfunction. The organic encapsulation layer 144 is formed through aninkjet process, and is made of an organic dielectric material, such asan acrylic resin, an epoxy resin, polyimide, polyethylene, or siliconoxycarbide (SiOC).

In the case in which the organic encapsulation layer 144 is formedthrough an inkjet process, a dam (not shown) is disposed to prevent theorganic encapsulation layer 144, which is in a liquid state, fromdiffusing to the edge of the substrate 101. By the provision of the dam,it is possible to prevent the organic encapsulation layer 144 fromdiffusing to a pad area, disposed at the outer edge of the substrate101, in which the first touch pads 170 and display pads (not shown) aredisposed.

The second inorganic encapsulation layer 146 is formed on the substrate101, on which the organic encapsulation layer 144 is formed, to coverthe upper surface and the side surface of each of the organicencapsulation layer 144 and the first inorganic encapsulation layer 142.Consequently, the second inorganic encapsulation layer 146 reduces orprevents the permeation of external moisture or oxygen into the firstinorganic encapsulation layer 142 and the organic encapsulation layer144. The second inorganic encapsulation layer 146 is made of aninorganic dielectric material, such as silicon nitride (SiNx), siliconoxide (SiOx), silicon oxide nitride (SiON), or aluminum oxide (Al₂O₃).

A color filter array including a color filter 124 and a black matrix 126is disposed on the encapsulation unit 140. At least one of a polarizingfilm (not shown) or a cover substrate (not shown) is disposed on thecolor filter array.

The color filter 124 is disposed on the encapsulation unit 140 tooverlap the light-emitting area exposed by the bank 138 formed at eachsubpixel area. A red (R) color filter 124 is formed on the encapsulationunit 140 in a red subpixel area, a green (G) color filter 124 is formedon the encapsulation unit 140 in a green subpixel area, and a blue (B)color filter 124 is formed on the encapsulation unit 140 in a bluesubpixel area.

The black matrix 126 serves to partition respective subpixel areas andto prevent optical interference and screen bleed between adjacentsubpixel areas. The black matrix 126 also serves as the second touchelectrode RE, and is thus grouped into a plurality of parts to beconnected to second touch-routing lines 182. Each of the grouped blackmatrices 126 is connected to a second touch pad 180 via the secondtouch-routing line 182 extending from the black matrix 126. The secondtouch-routing line 182 is disposed along the side surface of theencapsulation unit 140.

The second touch pad 180 is made of the same material as the secondtouch-routing line 182. The second touch pad 180 is disposed on thedielectric film disposed below the light-emitting element 130, forexample, the passivation film 118.

Meanwhile, in the present disclosure, as previously described, thecathode electrode 136 is used as the first touch electrode TE, and theblack matrix 126 is used as the second touch electrode RE.

As shown in FIG. 3, the cathode electrode 136 is grouped into aplurality of parts to be used as a plurality of first touch electrodesTE during a touch-sensing period. The cathode electrodes 136 in onegroup are separated from the cathode electrodes 136 in another group.

To this end, as shown in FIGS. 3 and 4, inversely tapered partitionwalls 148 are disposed on the bank 138 between the grouped cathodeelectrodes 136, whereby the cathode electrode 136 is divided into aplurality of parts by the partition walls 148. In addition, as shown inFIG. 5, a bank 138 forming an undercut structure together with thepassivation film 118 is disposed between the grouped cathode electrodes136, whereby the cathode electrode 136 is divided into a plurality ofgroups by the bank 138 forming the undercut structure together with thepassivation film 118.

The grouped cathode electrodes 136 are not divided from each other foreach subpixel but are formed to have a size corresponding to a pluralityof subpixel area in consideration of a user's touch area. For example,each of the grouped cathode electrodes 136 is formed in a bar shape tocorrespond to m subpixels (m being a natural number) in the firstdirection×n subpixels (n being a natural number greater than m) in thesecond direction, and is used as a single first touch electrode TE. Atthis time, the cathode electrode 136 is formed so as to have a structurein which the cathode electrode is longer in the second direction than inthe first direction.

During a display period, a low-voltage (VSS) driving signal is suppliedto the cathode electrode 136 through the first touch pad 170 and thefirst touch-routing line 184, and during a touch-sensing period, atouch-driving signal is supplied to the cathode electrode 136. Inaddition, a low-voltage driving signal is supplied to the cathodeelectrode 136 through the first touch pad 170, the first touch-routingline 184, first auxiliary line 192, second auxiliary line 194, shown inFIG. 6, during the display period, and a touch-driving signal issupplied to the cathode electrode 136 during the touch-sensing period.The first auxiliary line 192 is made of the same material as the sourceand drain electrodes 110 and 108, and is disposed on the interlayerdielectric film 116. The second auxiliary line 194 is made of the samematerial as the anode electrode 132, and is disposed on theplanarization layer 128. The second auxiliary line 194 is connected tothe first auxiliary line 192, which is exposed through an auxiliarycontact hole 196 formed through the passivation film 118 and theplanarization layer 128. In addition, the second auxiliary line 194 isconnected to the cathode electrode 136. Meanwhile, since the first andsecond auxiliary lines 192 and 194 are disposed between the groupedcathode electrodes 136, the low-voltage (VSS) driving signal and thetouch-driving signal are supplied to the respective cathode electrodes136 through the first and second auxiliary lines 192 and 194.

The black matrix 126 is made of an opaque conductive material. As shownin FIGS. 7A and 7B, the black matrix 126 is grouped into a plurality ofparts, and is used as the second touch electrode RE during thetouch-sensing period. The black matrices 126 in one group are separatedfrom the black matrices 126 in another group. Each of the grouped blackmatrices 126 is formed in a mesh shape to correspond to n subpixels (nbeing a natural number greater than m) in the first direction×msubpixels (m being a natural number) in the second direction, and isused as a single second touch electrode RE. At this time, the blackmatrix 126 is formed so as to have a structure in which the black matrixis longer in the first direction than in the second direction.

The black matrices 126 included in each of the second touch electrodesRE1, RE2, RE3, RE4, . . . are electrically connected to each other. Theblack matrices 126 between adjacent second touch electrodes RE1, RE2,RE3, RE4, . . . are separated from each other. For example, adjacentsecond touch electrodes RE1, RE2, RE3, RE4, . . . are spaced apart fromeach other in the state in which a zigzag space is providedtherebetween, as shown in FIG. 7A, or are spaced apart from each otherin the state in which a linear space is provided therebetween, as shownin FIG. 7B. The second touch electrodes RE are used as the blackmatrices 126, which are not disposed in the light-emitting area, therebyimproving visibility. In particular, the second touch electrodes REshown in FIG. 7A are superior to the second touch electrodes RE shown inFIG. 7B in terms of visibility.

In the present disclosure, as described above, the cathode electrode 136is used as the first touch electrode TE, and the black matrix 126 isused as the second touch electrode RE. That is, the touch sensor Cmhaving mutual capacitance is formed at the intersection between thecathode electrode 136 and the black matrix 126 during the touch-sensingperiod. In the present disclosure, therefore, it is possible to omit theprocess of forming the first and second touch electrodes TE and RE, anda separate adhesion process becomes unnecessary, whereby structuralsimplification is achieved while costs are reduced.

In addition, the first touch pad 170 connected to the cathode electrode136, used as the first touch electrode TE, and the second touch pad 180connected to the black matrix 126, used as the second touch electrodeRE, are formed on the substrate 101, on which the display pads aredisposed, thereby realizing a slim and narrow bezel.

FIG. 8 is a waveform view showing the waveform of a signal supplied to adisplay device having a touch sensor according to the present inventionduring one frame.

Referring to FIG. 8, one frame period 1F is temporally divided into adisplay period DP and a touch-sensing period TP. One touch-sensingperiod TP is allocated between two display periods DP. Alternatively,one display period DP is allocated between two touch-sensing periods TP.

During the display period DP, as shown in FIG. 9A, a pixel-drivingsignal (for example, a scan signal, a data signal, a low-voltage drivingsignal, or a high-voltage driving signal) is supplied to each subpixel.Here, the scan signal is the voltage of a gate pulse that is supplied toeach scan line SL, the data signal is the data voltage of an input imagethat is supplied to the data line DL during the display period, thelow-voltage (VSS) driving signal is the voltage supplied to the cathodeelectrode 136 of each light-emitting element 130 during the displayperiod DP, and the high-voltage (VDD) driving signal is the voltagesupplied to the drain electrode 108 of each driving transistor TD duringthe display period DP.

During the display period DP, the same low-voltage (VSS) driving signalis supplied to the cathode electrode 136, which is used as the firsttouch electrode TE, and the black matrix 126, which is used as thesecond touch electrode RE. Consequently, it is possible to prevent atouch-sensing operation from being performed during the display periodDP.

During the touch-sensing period TP, as shown in FIG. 9B, touch-drivingsignals are sequentially supplied to the cathode electrodes 136, whichare used as the first touch electrodes TE1, TE2, . . . , TEi, inresponse to a touch control signal Tsync from a timing controller (notshown). Subsequently, a change in the electric potential of the blackmatrices 126, which are used as the second touch electrodes RE1, RE2,RE3, . . . , is sensed in order to sense a touch position.

Meanwhile, although the structure in which the cathode electrode 136 isused as the first touch electrode TE and the black matrix 126 is used asthe second touch electrode RE has been described by way of example inthe present invention, the cathode electrode 136 may be used as thesecond touch electrode RE, and the black matrix 126 may be used as thefirst touch electrode TE.

As is apparent from the above description, in the present disclosure, acathode electrode is grouped into a plurality of parts so as to be usedas first touch electrodes, and a black matrix, which intersects thecathode electrode, is grouped into a plurality of parts so as to be usedas second touch electrodes. Consequently, it is possible to omit aprocess of forming the first and second touch electrodes, and a separateadhesion process becomes unnecessary, thereby achieving structuralsimplification while reducing costs.

In addition, touch pads connected to the first and second touchelectrodes are formed on a substrate on which display pads are disposed,thereby realizing a slim and narrow bezel.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A display device comprising: a light-emittingelement disposed on a substrate, the light-emitting element comprising aplurality of grouped cathode electrodes; an encapsulation unit disposedon the light-emitting element; and a plurality of grouped black matricesdisposed on the encapsulation unit, the plurality of grouped blackmatrices intersecting the cathode electrodes.
 2. The display deviceaccording to claim 1, further comprising: first touch-routing linesconnected to the plurality of grouped cathode electrodes; and secondtouch-routing lines connected to the plurality of grouped blackmatrices.
 3. The display device according to claim 2, furthercomprising: at least one dielectric film disposed below theencapsulation unit, wherein the first touch-routing lines are disposedon the dielectric film, and the second touch-routing lines are disposedalong a side surface of the encapsulation unit.
 4. The display deviceaccording to claim 1, further comprising a partition wall disposedbetween the plurality of grouped cathode electrodes.
 5. The displaydevice according to claim 4, wherein the partition wall intersects theplurality of grouped black matrices.
 6. The display device according toclaim 1, further comprising: a thin film transistor connected to ananode electrode of the light-emitting element; a passivation filmdisposed between the thin film transistor and the anode electrode; and abank disposed so as to expose the anode electrode, wherein the bank,which forms an undercut structure together with the passivation film, isdisposed between the plurality of grouped cathode electrodes.
 7. Thedisplay device according to claim 1, wherein the plurality of groupedcathode electrodes are separated from each other, and the plurality ofgrouped black matrices are separated from each other.
 8. The displaydevice according to claim 1, wherein each of the plurality of groupedblack matrices is formed in a mesh shape, and each of the plurality ofgrouped cathode electrodes is formed in a bar shape.
 9. The displaydevice according to claim 1, wherein the plurality of grouped blackmatrices are spaced apart from each other in a state in which a zigzagspace or a linear space is provided therebetween.
 10. The display deviceaccording to claim 1, further comprising a color filter disposed on theencapsulation unit.
 11. The display device according to claim 1, whereina touch sensor having mutual capacitance is formed at an intersectionbetween the cathode electrode and a black matrix from the plurality ofgrouped black matrices during a touch-sensing period.
 12. The displaydevice according to claim 11, wherein a same low-voltage driving signalis supplied to the cathode electrode and the black matrix during adisplay period, and a touch-driving signal is supplied to the cathodeelectrode during the touch-sensing period, and a touch is sensed usingthe black matrix.
 13. A display device comprising: a light-emittingelement disposed on a substrate, and a touch sensor configured by oneelectrode of the light-emitting element and a black matrix disposed overthe light-emitting element and intersects the one electrode.
 14. Thedisplay device according to claim 13, wherein, the one electrode is acathode electrode of the light-emitting element, the cathode electrodecomprises a plurality of grouped cathode electrode.
 15. The displaydevice according to claim 13, further comprises an encapsulation unitdisposed on the light-emitting element, the black matrix is disposed onthe encapsulation unit, and comprises a plurality of grouped blackmatrices.
 16. The display device according to claim 13, furthercomprises a touch pad, the touch pad includes a touch pad connected withthe one electrode and a touch pad connected with the black matrixdisposed adjacent to each other or disposed on a same side of thesubstrate.
 17. The display device according to claim 16, wherein thetouch pad includes a first touch pad connected to the one electrode anda second touch pad connected to the black matrix.
 18. The display deviceaccording to claim 13, wherein a same low-voltage driving signal issupplied to the one electrode and the black matrix during a displayperiod, and a touch-driving signal is supplied to the one electrodeduring a touch-sensing period, and a touch is sensed using the blackmatrix.